Git commits in Moodle 3.9.15 by Paul Holden

commit af8c168f78c96d345cf231db586f4a22751e5b97
Author: Paul Holden <paulh@moodle.com>
Date:   Tue, 08 Feb 2022 05:22:50 +0800
Tag:    v3.9.15

MDL-73801 backup: set predictably ordered backup next start time.


commit 4a8abf77ac1b3b4368a8c03b44b524e620c57db9
Author: Paul Holden <paulh@moodle.com>
Date:   Thu, 13 May 2021 22:03:07 +0800
Tag:    v3.9.15

MDL-71276 message_email: include alternate email in privacy export.